diff --git a/backend/app/models/paper_trading.py b/backend/app/models/paper_trading.py
index c8cdf69..be07c9f 100644
--- a/backend/app/models/paper_trading.py
+++ b/backend/app/models/paper_trading.py
@@ -65,7 +65,7 @@ class PaperOrder(Base):
     signal_type = Column(String(20), default="swing")  # swing / short_term
     confidence = Column(Float, default=0)              # 置信度 (0-100)
     trend = Column(String(20), nullable=True)          # 趋势方向
-    entry_type = Column(SQLEnum(EntryType), default=EntryType.MARKET)  # 入场类型
+    entry_type = Column(SQLEnum(EntryType, values_callable=lambda x: [e.value for e in x]), default=EntryType.MARKET)  # 入场类型
 
     # 订单状态
     status = Column(SQLEnum(OrderStatus), default=OrderStatus.PENDING, index=True)
diff --git a/update.sh b/update.sh
index 4243d97..b08deff 100755
--- a/update.sh
+++ b/update.sh
@@ -30,7 +30,11 @@ if [ -f "$DB_PATH" ]; then
         sqlite3 "$DB_PATH" "ALTER TABLE paper_orders ADD COLUMN entry_type VARCHAR(10) DEFAULT 'market';"
         echo "  entry_type 列已添加"
     else
-        echo "  entry_type 列已存在，跳过"
+        echo "  entry_type 列已存在"
+        # 修复可能存在的大写值问题
+        sqlite3 "$DB_PATH" "UPDATE paper_orders SET entry_type = 'market' WHERE entry_type = 'MARKET';"
+        sqlite3 "$DB_PATH" "UPDATE paper_orders SET entry_type = 'limit' WHERE entry_type = 'LIMIT';"
+        echo "  entry_type 值已标准化"
     fi
 else
     echo "  数据库文件不存在，将在首次运行时创建"